/Engine/Plugins/Interchange/Runtime/Source/Nodes/Public/InterchangeShaderGraphNode.h
Shader is transparent or opaque if it's alpha is lower or higher than the clip value.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Interchange | Node | Material") bool SetCustomOpacityMaskClipValue ( const float & AttributeValue, bool bAddApplyDelegate )